This Operator is used to check presence of data in Subquery .
If there are any records in Subquery ,
This operator will return “TRUE” otherwise It will return FALSE.
be used with SELECT, DELETE,INSERT,UPDATE Statement.
SELECT COLUMN_NAME FROM TABLE_NAME WHERE EXISTS
(SELECT COLUMN_NAME FROM TABLE_NAME)
Example : There are created “Employee” and "Department" tables in a database
The following query will return DepartmentName of “Employee” for DepartmentId which exists in “Employee” Table.
SELECT NAME AS 'DEPARTMENT NAME' FROM DEPARTMENT D
WHERE EXISTS (SELECT NAME FROM EMPLOYEE E WHERE E.DEPARTMENTID=D.ID )
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